Teaching EMRS PGT Mock Test 2023 Mathematics Trigonometry Trigonometric Identities

(cos α + cos β)2 + (sin α + sin β)2 =

1
4 cos2\(\frac{α - β}{2}\)
2
4 sin2 \(\frac{α - β}{2}\)
3
4 cos2\(\frac{α + β}{2}\)
4
4 sin2  \(\frac{α + β}{2}\)
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